From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5F3F5C46469 for ; Wed, 12 Sep 2018 13:23:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1F12E20882 for ; Wed, 12 Sep 2018 13:23:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1F12E20882 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727600AbeILS1e (ORCPT ); Wed, 12 Sep 2018 14:27:34 -0400 Received: from mail-it0-f72.google.com ([209.85.214.72]:42686 "EHLO mail-it0-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726672AbeILS1d (ORCPT ); Wed, 12 Sep 2018 14:27:33 -0400 Received: by mail-it0-f72.google.com with SMTP id 20-v6so3355256itb.7 for ; Wed, 12 Sep 2018 06:23:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=garQHtwIgcq/wy5OsBOzsZScrWqINWEHbMTxY+l8Kmk=; b=tWZI3yxH3w+xvGdqnkzi6TZteEnfpN42wDK8+fGTDacr0MSjGQEqeIwtd+xZyDk/b5 M2Qv3r5kuxTd/D/XtvwbP/D6/VNgrOfbnaB/1GGNtUid9LaLwGsFgmhpGr8c+C89MZiv Q80yAC3Bw6OVLSSVMCXgi1L/zShqXJmnQdCc7f8RLsHRRzmsoX8h02zBlaeouKs8sI0x R49ALMztp21bgqATw9GU6eHIGDXjU1uTcJAq2RiwSKHl9h6DaV/bGtseyGFF6Nnjd7hR gKyzHHdQTLVWWMs5eZN6zNgcHz8rUrDP5lxJ5phX+FrgIsoySn4u+W0LonWpn+aC2fsE hmgQ== X-Gm-Message-State: APzg51Bd8t5IYLnO+RlzboHglVlCVsWiUR7TqyIM5f4LW0O3ddyVLQhc /q7C4BdzPz3UVb9OPuhYP9M/T2m5dKvK72q2z4KUAz8pBMTi X-Google-Smtp-Source: ANB0VdYhYqjRIaTDikLW8S3CQtJ54ZCS3rOUnFAavAON4DmuUIufx8FncoD6pC5Ncq2mMJCg9DlmE2wniCdLZA3/KW7+aRfCRfSd MIME-Version: 1.0 X-Received: by 2002:a6b:e902:: with SMTP id u2-v6mr1517399iof.105.1536758583104; Wed, 12 Sep 2018 06:23:03 -0700 (PDT) Date: Wed, 12 Sep 2018 06:23:03 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000739dd40575ac7d07@google.com> Subject: general protection fault in lockref_get From: syzbot To: akpm@linux-foundation.org, arnd@arndb.de, dhowells@redhat.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 7c1b097f27bf Add linux-next specific files for 20180912 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1333df01400000 kernel config: https://syzkaller.appspot.com/x/.config?x=5980033172920ec0 dashboard link: https://syzkaller.appspot.com/bug?extid=5dc733a19636067b82fd compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+5dc733a19636067b82fd@syzkaller.appspotmail.com random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: cc1: uninitialized urandom read (8 bytes read) kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5580 Comm: syz-executor0 Not tainted 4.19.0-rc3-next-20180912+ #72 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x237/0x4ec0 kernel/locking/lockdep.c:3291 Code: 28 00 00 00 0f 85 aa 33 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 6d 35 00 00 49 81 7d 00 20 90 9e 8a 0f 84 54 ff RSP: 0018:ffff8801d36ff430 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 1ffff1003a6dff03 RCX: 0000000000000000 RDX: 0000000140000014 RSI: 0000000000000000 RDI: ffffffff89722928 RBP: ffff8801d36ff7c0 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000a000000a0 R14: ffff8801b9cde100 R15: 0000000000000000 FS: 0000000000db8940(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000482e00 CR3: 00000001b9d4f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144 lockref_get+0x15/0x50 include/linux/spinlock.h:329 dget include/linux/dcache.h:322 [inline] mqueue_get_tree+0x101/0x2e0 ipc/mqueue.c:362 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1787 mq_create_mount+0xe3/0x190 ipc/mqueue.c:415 mq_init_ns+0x15a/0x210 ipc/mqueue.c:1621 create_ipc_ns ipc/namespace.c:58 [inline] copy_ipcs+0x3d2/0x580 ipc/namespace.c:84 create_new_namespaces+0x376/0x900 kernel/nsproxy.c:87 unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:206 ksys_unshare+0x79c/0x10b0 kernel/fork.c:2535 __do_sys_unshare kernel/fork.c:2603 [inline] __se_sys_unshare kernel/fork.c:2601 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2601 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459d87 Code: 00 00 00 b8 63 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 3d 8a fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 1d 8a fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffcccf0eee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459d87 RDX: 0000000000000000 RSI: 00007ffcccf0eef0 RDI: 0000000008000000 RBP: 0000000000930b28 R08: 0000000000000000 R09: 0000000000000018 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010 R13: 0000000000412cc0 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 404378fbbfe9896c ]--- RIP: 0010:__lock_acquire+0x237/0x4ec0 kernel/locking/lockdep.c:3291 Code: 28 00 00 00 0f 85 aa 33 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 6d 35 00 00 49 81 7d 00 20 90 9e 8a 0f 84 54 ff RSP: 0018:ffff8801d36ff430 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 1ffff1003a6dff03 RCX: 0000000000000000 RDX: 0000000140000014 RSI: 0000000000000000 RDI: ffffffff89722928 RBP: ffff8801d36ff7c0 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000a000000a0 R14: ffff8801b9cde100 R15: 0000000000000000 FS: 0000000000db8940(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000482e00 CR3: 00000001b9d4f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.